In the year 367, the Christian bishop of Alexandria in Egypt, Athanasius, was the chief defender of
Trinitarianism against
Arianism. Some of the churches of the time were not teaching the trinity which caused problems for some of the churches. Why? How did Athanasius convince the people scripturally that the trinity was true? Some religions or
nontrinitarian Christians today are growing in numbers. They use the bible to try to disprove the trinity and gain members. How is this possible? Do the scriptures teach the trinity or not?
No, they manifestly don't.
There are five versions of Jesus in the NT, one each for Paul and each gospel. Each of the five expressly denies he's God, and never claims to be God:
Paul says,
1 Corinthians 8:6 yet for us there is one God, the Father, from whom are all things and for whom we exist, and one Lord, Jesus Christ, through whom are all things and through whom we exist.
Philippians 2:11 and every tongue confess that Jesus Christ is Lord, to the glory of God the Father.
Mark
Mark 12:29 Jesus answered, “The first is, ‘Hear, O Israel: The Lord our God, the Lord is one [...] 32 And the scribe said to him, “You are right, Teacher; you have truly said that he is one, and there is no other but he;
Matthew
Matthew 20:23 He said to them, “You will drink my cup, but to sit at my right hand and at my left is not mine to grant, but it is for those for whom it has been prepared by my Father.”
Matthew 24:
36 “But of that day and hour no one knows, not even the angels of heaven, nor the Son, but the Father only.”
Luke
Luke 18:18 And a ruler asked him, “Good Teacher, what shall I do to inherit eternal life?” 19 And Jesus said to him, “Why do you call me good? No one is good but God alone.”
John
John 8:42 “I proceeded and came forth from God; I came not of my own accord, but he sent me.”
John 10:29 “My Father [...] is greater than all”
John 14:28 [...] I go to the Father; for the Father is greater than I.
John 17:3 “And this is eternal life, that they know thee the only true God, and Jesus Christ whom thou hast sent.”
John 20:17 “I am ascending to my Father and your Father, to my God and your God.”
To which we can also add:
1Timothy 2:5 For there is one God, and there is one mediator between God and men, the man Christ Jesus,
Despite the many plain denials in John (there are more than just those above), it is sometimes claimed that
John 8:58 Jesus said to them, "Truly, truly, I say to you, before Abraham was, I am."
However, John's Jesus is one the of the two gnostic models of Jesus (Paul's is the other) who pre-existed in heaven and who created the material world ─
1 Corinthian 8:6 yet for us there is one God, the Father, from whom are all things and for whom we exist, and one Lord, Jesus Christ, through whom are all things and through whom we exist.
John 1:2 He was in the beginning with God; 3 all things were made through him, and without him was not anything made that was made.
The reference is to that pre-existence, not to be God.
Another claim is sometimes made for
John 10:30 [...] “I and the Father are one.”
However. the meaning of this is made clear in John 17
John 17:20 “I do not pray for these only, but also for those who believe in me through their word, 21 that they may all be one; even as thou, Father, art in me, and I in thee, that they also may be in us, so that the world may believe that thou hast sent me. 22 The glory which thou hast given me I have given to them, that they may be one even as we are one, 23 I in them and thou in me, that they may become perfectly one, so that the world may know that thou hast sent me and hast loved them even as thou hast loved me.